Organocatalytic oxidation of aldehydes to mixed anhydrides
作者:Hila Toledo、Evgeni Pisarevsky、Adi Abramovich、Alex M. Szpilman
DOI:10.1039/c2cc35220f
日期:——
TEMPO catalyzes the direct oxidation of aldehydes to mixedanhydrides in the presence of a carboxylic acid. The anhydrides can be converted in situ to esters, secondary, tertiary or Weinreb amides in high yield. Oxidation of the aldehyde directly to 2-propyl esters is also possible using only catalytic amounts of acid. The oxidation reactions are rapid and take place under mild conditions.
Process for the preparation of carboxylic benzyl esters
申请人:——
公开号:US20030233008A1
公开(公告)日:2003-12-18
Carboxylic benzyl esters can be prepared by reacting benzyl chloride with carboxylic acids in the presence of one or more quaternary ammonium carboxylates as catalyst.
作者:Cyril Henry、David Bolien、Bogdan Ibanescu、Sally Bloodworth、David C. Harrowven、Xunli Zhang、Andy Craven、Helen F. Sneddon、Richard J. Whitby
DOI:10.1002/ejoc.201403603
日期:2015.3
Ketenes were generated by the thermolysis of alkoxyalkynes under flow conditions, and then trapped with amines and alcohols to cleanly give amides and esters. For a 10 min reaction time, temperatures of 180, 160, and 140 degrees C were required for >95 % conversion of EtO, iPrO, and tBuO alkoxyalkynes, respectively. Variation of the temperature and flow rate with inline monitoring of the output by
酮基是通过在流动条件下热解烷氧基炔烃而生成的,然后用胺和醇截留以干净地得到酰胺和酯。在10分钟的反应时间内,分别需要180、160和140摄氏度的温度才能分别使EtO,iPrO和tBuO烷氧基炔烃的转化率> 95%。温度和流速的变化以及通过红外光谱对输出的在线监测使得可以容易地估计用于1-乙氧基-1-辛炔转化的动力学参数(E a = 105.4 kJ / mol)。用醇捕集原位生成的乙烯酮以得到酯,需要添加叔胺催化剂以防止将乙烯酮竞争性地[2 + 2]加成至烷氧基炔烃前体。
Process for the preparation of benzyl carboxylates
申请人:——
公开号:US20030055279A1
公开(公告)日:2003-03-20
Benzyl carboxylates can be prepared by reacting dibenzyl ethers with carboxylic acids and optionally carboxylic anhydrides in the presence of one or more, preferably one, acids applied to a support as catalyst.
Process for the synthesis of esters and amides of carboxylic acids
申请人:Montefiore Medical Center
公开号:US04780542A1
公开(公告)日:1988-10-25
The invention relates to the preparation of an ester or an amide from an anhydride with an alcohol or an amine, wherein the anhydride is first prepared by reacting an acid and an alkyl chloroformate in a 100% aqueous medium, that is, 100% water.